Need Replacement

My only Xfinity TV box is an Arris Xi6-A, model AX061AEI. It repeatedly gives me error RDK-03117 and stops working. I've restarted the TV box and Gateway multiple times, but the problem keeps returning.

The equipment-update page says I already have the latest equipment, so I am NOT looking for an upgrade. I need the malfunctioning Xi6-A replaced.

Please have an Xfinity Support agent arrange an equipment replacement/shipment for me.